To answer the OP: You've a lot of opinions here, and here's mine on the pile...
A heretic is not the average every day person....Those who believe wrong doctrine, who are your average every day Joe/Jane are simply people who believe wrong doctrine. I don't think the ECF really meant the "unwashed peasants" when they were defending the Faith against heresy. They were not pointing the fingers at the masses but at those who KNOWINGLY AND WILLFULLY led others astray. I don't think there is any ECF that would have screamed "heretic" at some poor, uneducated, illiterate member of the Church who got bushwhacked with heresy. They surely would have sought to correct them but that is different entirely from pronouncing "Heretic" on Joe or Jane.
St. Maximos was a champion in fighting against the heresy of the "Monothelites" (it says there is only one nature in Christ, that is Divine). He was beaten, scourged and endured many trials for objecting...they even cut out his tongue...but in the end, the Monothelite Patriarch eventually renounced the heresy and admitted that Maximos was correct!

He was condemning not the populace of every day people, but their LEADERS as heretics.
Here's what St. Maximos the Confessor had to say:
"When all the people in Babylon were worshipping the golden idol, the Three Holy Youths did not condemn anyone to perdition. They did not concern themselves with what others were doing, but took care only for themselves, so as not to fall away from true piety. In precisely the same way, Daniel also, when cast into the den, did not condemn any of those who, in fulfilling the law of Darius, did not want to pray to God; but he bore in mind his duty, and desired rather to die than to sin and be tormented by his conscience for transgressing God's Law. God forbid that I, too, should condemn anyone, or say that I alone am being saved. However, I would sooner agree to die than, having apostatized in any way from the right faith, endure the torments of my conscience."
Praise God for true Saints like St. Maximos!
